JP2610196B2 - Core automatic exchange method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to an injection molding machine for injecting a molten synthetic resin material into a mold cavity and molding the same.

Conventional technology Injection molding machine basically has an injection part and a mold clamping part, forms a molding cavity between a fixed mold and a movable mold attached to the mold clamping part, and melts from the injection part into this. It has a structure to inject resin and the like. And when it comes to a mold clamping part, there is a thing provided with a mold exchange mechanism and a mold temperature control mechanism.

The mold exchanging mechanism is necessary for easily exchanging a heavy mold when a molded product is changed. However, when the product is small, it is more efficient to replace the core forming the molding cavity than to replace the entire mold including the mold base. In this case, it is preferable that the temperature of the core is previously adjusted to the temperature at the time of use, from the viewpoint of quick start-up of the work.

The mold temperature control mechanism is necessary to maintain the temperature of the mold at a level suitable for the characteristics of the resin being molded and to obtain a uniform molded product. However, the temperature control liquid supply hose of the temperature control device is adhered to the mold, and it takes time and effort to repeat attachment and detachment every time the mold is replaced. Also, because the hose cannot be placed in the fixed position,
The hose for supplying the temperature control liquid may interfere with the operation.

Furthermore, after use, it is necessary to store the mold after cleaning its cavities and joint surfaces. Conventionally, cleaning is performed manually, and automatic conversion of the mold side (core Replacement) and storage was manual.

Problem to be Solved by the Invention The present invention aims to provide a system for automatically replacing cores without relying on humans. It is an object of the present invention to provide a method of automatically cleaning a joint surface and exchanging a core, and an automatic core exchanging method capable of shortening a time until a molding operation is started when the core is automatically exchanged.

Means for Solving the Problems The present invention relates to a core stocker for storing a plurality of cores as a pair by assembling a fixed side and a movable side, a core selecting means for selecting a core, and a pair of cores. Core exchange means for taking out the core from the core stocker, transporting the core to the mounting position of the mother die, and transporting and storing the core from the mounting position to the core stocker, and each of the pair of cores corresponds to When the core is attached to the matrix by providing each locking means for fixing to each matrix to be formed and control means for controlling each of these elements, the core inputted to the control means is The core selection means is driven and selected, the core exchange means is driven, the selected core is transported from the core stocker to the mounting position of the mother die, and the movable platen is moved to transfer the core to each mother. Lock the pair of cores to each matrix with each locking means. When the core is automatically attached to the mother die and the core is removed from the mother die, the pair of cores are joined and held in the core holding part of the core exchange means, and the locking means is The core is released and the pair of cores is conveyed by the core exchange means and automatically stored in the core stocker. Also, an automatic cleaning device is provided, when the core is removed from the mother die, the movable platen is moved to open the joint surface of the core, and the nozzle of the automatic cleaning device is positioned between the separated core bonding surfaces. The cleaning liquid was spouted out, and after the core joint surface was washed, the core was taken out. Further, each core storage section of the core stocker has a heater for heating the core and a temperature sensor for detecting the temperature of the core storage section, and the control means controls each core storage section respectively. The core is preheated by feedback control to the set temperature, and when the core is replaced, the core quickly reaches a set temperature suitable for starting the molding operation.

Operation When the core is selected and the core replacement command is input to the control means, the control means sets the core mounted on the mother die into a joined state if the core is mounted on the mother die. The core is held by the holding part of the core changing means, the lock by the locking means is released, the movable platen is moved to open the space between the mother dies, and the held cores are transported to the core stocker for storage. Then, the selected core is selected by the core selecting means, the selected core is held by the holding part of the core replacing means, transported, transported to the mounting position on the mother die, and the movable platen is moved. Then, the cores are set in the respective masters, and the locking means is operated to lock the cores to the masters. When the core is removed from the matrix, the joint surface of the core is opened before the core is removed, and the joint surface of the core is cleaned by the cleaning device. Further, the core in the core stocker is maintained at a preset temperature, so that when the core is automatically exchanged, the molding operation can be quickly shifted to.

Embodiment [First Embodiment] FIG. 1 is a block diagram showing the entirety of a first embodiment of an injection molding machine according to the present invention. This injection molding machine 1 comprises an injection section 2 and a mold clamping section 3. A mold temperature control mechanism 5, a core exchange mechanism 6,
A core protruding device 7 and a mold cleaning device 8 are additionally provided, and an NC device 9 for unifying and controlling the entire operation is provided.

The structure and process related to the injection molding of the main body 4 are the same as those in the related art, and the description is omitted.

(Mold temperature control mechanism)

The mold temperature control mechanism 5 (FIG. 2) includes a mold temperature control device 10, a temperature control liquid passage 13, a temperature control liquid passage 15, and an automatic connection structure 16 between the two temperature control liquid passages 13,15. .

The temperature control liquid passage 13 is formed in the fixed platen 11 and the movable platen 12 (13a, 13b..., Hereinafter, the fixed platen side is a, the movable platen side is b, and when not indicated, it means both). The temperature control passage 15 is formed by a mold matrix 14 (a, b).
(15a, 15b). Therefore, the automatic connection structure 16 is formed between the temperature control liquid passages 13 and 15 formed between the platens 11 and 12 and the respective master dies 14.

Reference numeral 17 denotes a core having a molding cavity and a fixed side portion 17.
a and the movable portion 17b form a pair. Both parts 17a, 17b
When they are fitted in a pair, they are in close contact with each other due to the fitting structure having the pins and the pin holes, which are not separated in a normal carrying state.

Reference numeral 18 denotes a tie bar, which connects the fixed platen 11 and a rear platen (not shown), and the movable platen 12 is slidably mounted.

The mold temperature device 10 is a device that adjusts a temperature control liquid, which is water or oil, to a predetermined temperature, supplies the temperature control liquid to the temperature control liquid passages 13 and 15, and circulates the same.

The mold temperature control device 10 includes a fixed platen 11 and a movable platen 12 at supply tubes 19 and 20 (feed side p and return side r, respectively).
Is connected to the temperature control fluid passage 13 (a, b) of the
The solenoid valves 21 controlled by the NC device 9 are provided on the paths of 9p and 20p.
(A, b) are connected.

The solenoid valve 21 is a two-way switching valve. The passage to the platen (11, 12) and the bypass passage q
(From the sending side p to the returning side r).

Temperature control liquid passage 15 (a, b) in mold base 14 (a, b)
3 is formed by connecting straight holes provided in the matrix 14 in series with a tube 22 as shown in FIG. 3, and connecting communication holes from the front or rear surface of the matrix 14.

Then, the temperature control liquid passage 13 on the fixed platen 11 and the movable platen 12 side and the temperature control liquid passage 15 on the matrix 14 are connected by an automatic connection structure 16 shown in FIG.

That is, one of the opposing ends of the temperature control liquid passages 13 and 15 (the platen-side temperature control liquid passage 13) is formed in a port 23 having a large diameter or an annular shape.
It has a structure with a ring 24 attached, and a port
The other end of the temperature-adjusting liquid passage having a smaller diameter than 23 (temperature-adjusting liquid passage 15 on the mother die side) is pressed from the front and joined. In this case, the O-ring 24 before the matrix 14 is pressed.
When the mold is replaced, the amount of protrusion between the platen 11 and the mold (the mold 14 and the core 17) disposed between the fixed platen 11 and the movable platen 12 from above or from the side It is supposed to be smaller than the clearance.

Reference numeral 25 its clamped state in a mold clamping device, the release state is transmitted to the NC device 9 in such a sensor S ₁ for detecting and outputting a clamped state.

Reference numeral 26 denotes a screw stopper that covers an unnecessary end of a straight hole provided in the matrix 14.

[Operation of Mold Temperature Control Device] When the mold (master mold 14) is attached to each of the fixed platen 11 and the movable platen 12, and the operation of the mold clamping device 25 provided in the main body 4 is completed, the electromagnetic valve 21 The operation command for (a, b) is released, these solenoid valves 21 are switched to the supply side by a command from the NC device 9, and the temperature control fluid is fixed from the mold temperature control device 10 through the supply tubes 19, 20 to the fixed platen. 11, is supplied to the movable platen 12 and circulates through the mold matrix 14. Thereby, the core 17 is maintained at the set temperature.

The solenoid valves 21 (a, b) are switched to the bypass passage q side when exchanging the mother die 14, thereby preventing wasteful heat consumption and preventing the temperature-adjusted liquid from spouting when the mold is removed. It is supposed to.

With such a configuration, the mold temperature control hose is fixedly connected to the fixed platen and the movable platen, and the connection with the mold base is automatically performed. The labor required for attaching and detaching is reduced. Also, since the mold temperature control hose is fixedly connected to the platen, it is almost at a fixed position, and there is no need to be troubled by a temperature control tube at an unexpected position during the operation.

(Core exchange mechanism)

The core exchange mechanism 6 (FIGS. 5, 6, and 7) includes a core exchange device 27 and a core stocker 28, and the stocker 28 includes a core preliminary temperature control function (described later). .

The core changing device 27 has a rotating arm 30 (FIG. 6), a servomotor M ₁ for driving the rotating arm 30, a pushing actuator 31, and a returning actuator 32.

The tip of the rotating arm 30 is formed on a core holding ring 33,
The base is pivotally supported by a single tie bar 18 so as to be rotatable around the tie bar 18 at a fixed position. The position where the rotating arm 30 is pivotally supported is the upper one tie bar 18, which is near the fixed platen 11.

In the core holding ring 33, a hole having an inner diameter substantially equal to the outer diameter of the core 17 penetrates in the front-rear direction, and moves in parallel along the rear surface of the fixed platen 11 (the injection unit 2 side is the front). The inner surface of the hole is covered with a soft metal such as brass to protect the core.

The base of the rotating arm 30 is a gear G ₁ is fixed, to which said gear G ₂ is engaged the servo motor M ₁ attached to the top of the stationary platen 11. Operation of the servo motor M ₁ is controlled by the NC apparatus 9.

The push actuator 31 and the return actuator 32 are operated by solenoid valves 34 and 35 with air actuators.
The solenoid valves 34 and 35 are two-way switching valves for switching between air supply and exhaust to the actuators 31 and 32, and are switched by a command from the NC device 9. Each of the pistons of the actuators 31 and 32 has a spring therein, protrudes by a predetermined stroke by air supply, is quickly drawn in by the internal spring by exhaustion, and returns to the home position.

The core stocker 28 has a plurality of storage holes 36 (through holes) that can store a plurality of cores 17 along the circumference as shown in the figure.
And is rotatably supported on a stay 37 attached to the fixed platen 11 by a shaft 38 in the front-rear direction.
The core stocker 28 has a rear surface disposed forward of a bottom surface of the core mounting groove 39 in the matrix 14a (FIG. 5).

The outer periphery of the core stocker 28 is gear G ₃ is fixed, the gear G ₄ of the servomotor M ₂ attached thereto on top of the stay 37 is engaged. Operation of the servo motor M ₂ is controlled by the NC apparatus 9.

In the core stocker 28, a heater 40 and a thermocouple 41 are arranged for each of the storage holes 36 for storing the core 17, as shown in FIG.
Each is connected to a temperature converter 72 (described later).

The heater 40 is a sheathed heater sealed in a metal cylinder, and a heat insulating layer 43 is formed between the heater 40 and the casing 42 of the stocker 28 to form another storage hole.
It is designed to prevent the mutual interference of heat generated between them with 36 as much as possible.

If the core stocker 28 has the preliminary temperature control function, the start-up from the core replacement to the start of the molding operation is quick, and the efficiency is good.

Push actuator 31 and return actuator above
32 is a predetermined position relative to the core stocker 28, that is, any one of the cores 17 housed by rotation of the stocker 28 can be disposed between both actuators 31, 32, and the rotating arm 30 The core holding ring 33 is located at a predetermined position where the core stocker 28 can be reached and is opposed to the front and rear with the core stocker 28 interposed therebetween (FIG. 5).

The arrangement of the push-out actuator 31 and the amount of protrusion of the piston are determined by moving the core 17 (a and b are fitted and integrated) accommodated in the storage hole 36 of the core stocker 28 from the front to the rear. This is an amount that can be protruded and transferred to the core holding ring 33, and the arrangement of the return actuator 32 and the amount of protrusion of the piston can be adjusted by moving the core 17 held by the core holding ring 33 into the storage hole 36 of the stocker 28. This is the amount that can be pushed back in and released from the core holding ring 33.

Therefore, the core retaining ring 33 is
It is located between 32 and the rear surface of the stocker 28, and is arranged to rotate along the rear surface of the stocker 28.

Note that the width (thickness) of the core holding ring 33 in the front-rear direction is slightly smaller than the distance when the master blocks 14a and 14b are closest to each other in the mold clamping state.

Letter S ₂ designates intended to detect whether the core 17 in the gap between the core holding ring 33 and the core stocker 28 at the transfer position by the photoelectric sensor is present, turned on in the absence. The reference numeral S ₃ is a magnetic sensor, disposed at the entrance of the core housing hole 36, and detects whether the core 17 is present in the receiving hole 36, turned on when the person is present .

Here, on the rear side of the matrix 14, a dovetail-shaped core whose rear is opened from the top surface to the position of the spool bush 44 at the center of the matrix 14 a as shown in FIGS. 9 and 6 and 7. Mounting groove 39
Are formed along the trajectory of the rotary arm 30 in the core exchange mechanism 6, and the sprue
A stopper 45 is arranged near 44.

The core mounting groove 39 has a dovetail-shaped cross section wide at the entrance side, and the core 17 has a core 17 around the sprue bush 44 at the end.
The size of the groove is exactly the same as the outer shape of the core, so that the core 17 mounted at the end has no backlash.

In addition, the stopper 45 moves backward from the front side of the matrix 14a,
It is arranged to penetrate the outer mold and is driven by the air actuator 46. The air actuator 46 includes an electromagnetic valve 47 that operates according to a command from the NC device 9. The solenoid valve 47 is a two-way switching valve that switches between an air supply side and an exhaust side of the actuator 46.

On the other hand, in the center of the movable-side mold 14b, a tapered core mounting hole 48 whose peripheral surface is slightly narrowed inward corresponding to the end of the core mounting groove 39 (FIG. 5). Are formed.

Further, the core 17 has a cylindrical structure as a whole, and a molding cavity (for a lens) is formed on a joint surface between the fixed side portion 17a and the movable side portion 17b.

The fixed side portion 17a of the core 17 is formed with a resin flow path (runner) connected to the sprue bush 44 mounted on the matrix 14a, and has an annular groove 49 on the outer periphery and a cross section matching the dovetail groove. Have been.

A hole 51 (FIG. 10) through which an eject rod 50 of a core projecting device 7 described later penetrates is formed in the movable side portion 17b of the core 17, and an eject pin 52 having a diameter smaller than the diameter of the hole 51 is formed at the tip end thereof. Are slidably disposed in the front-rear direction. A return spring 53 for urging the eject pin 52 backward is disposed in the hole 51.

[Core protruding device]

The core extension device 7 (FIGS. 6 and 10) is a through-type servo motor mounted on the center of the rear surface of the movable platen 12.
M ₃ , eject rod 50 directly connected to its motor shaft 55
And a solenoid 54 arranged on both sides of the motor shaft 55, and the rod 50 is formed in a matrix form from the rear surface of the movable platen 12.
It penetrates into the core mounting hole 48 of the core 14b, and is arranged so as to be slidable in the hole 56 connected to the hole 51 when the movable part 17b of the core 17 is mounted.

Transmembrane servomotor M ₃ are a ball screw which is allowed to motor shaft 55 only slides in the axial direction and having a structure which includes a ball nut for rotation with the rotor inside, is controlled by the NC apparatus 9. Therefore, when driven, the motor shaft 55 is directly moved back and forth in the axial direction.

The eject rod 50 is protruded forward to perform a first-stage operation in which only the eject pin 52 is pushed to project the product, and a second-stage operation in which the eject rod 50 further advances to project the movable side portion 17b of the core forward. It has become.

Further, the plunger 54 'of the solenoid 54 is operated in a short time, and is a kind of electromagnetic hammer which is abutted against the core 17b.

The through-type servomotor M ₃ are can be replaced by an air actuator of the two-stage operation.

[Mold cleaning device]

The mold cleaning device 8 (FIGS. 11, 6 and 7) includes a nozzle 58 provided with an electromagnetic valve 57 and an electromagnetic valve 59, and the nozzle 58
An air actuator 60 is attached to the tip of the piston and moves up and down.

The solenoid valve 57 is an on-off valve, and the solenoid valve 59 is a two-way switching valve for switching between air supply and exhaust, and both operations thereof are controlled by the NC device 9.

Air actuator 60 comprises a sensor S ₄ for outputting a detection signal in the state in which stretched the nozzle 58 from the upper end of the home position of the piston and the piston of a constant stroke can be moved to the core mounting position of the lower. This actuator 60 has a spring inside, allows the piston to be quickly retracted in the exhausted state, and allows the nozzle 58 to be in the upper home position. It is mounted on a stand 61 that can adjust the angle in three axes (vertical, horizontal, vertical). Have been. The stand 61 is fixed to the top surface of the fixed platen 11, and by manually adjusting the angle of each axis, the attitude of the air actuator 60, that is, the direction in which the nozzle 58 is moved can be arbitrarily determined.

 A cleaning liquid is supplied to the nozzle 58 through a hose 62.

[Control device] FIG. 12 shows the heating cylinder and each core 17 of the core stocker 28.
FIG. 4 is a block diagram of a configuration of a control unit for controlling the temperature of FIG.

In FIG. 12, 70 is a screw, 71 is a heating cylinder, the heating cylinder 71 is divided into a plurality of heating zones,
Band heaters B1 to B3 are attached to each heating zone, and the band heaters B1 to B3 are connected to a power supply 73 via switches SW1 to SW3 to heat the heating cylinder 71. Further, thermocouples 74-1 to 74-3 are provided in each heating zone to detect the temperature of each heating zone.
Outputs of -1 to 74-3 are input to the temperature converter 72.
Further, the temperature converter 72 has respective storage holes of the core stocker 28.
Each thermocouple 41 disposed adjacent to 36 is connected, and the temperature converter 72 is connected to each thermocouple 41 and 74-1 to 74 in accordance with a selection signal output from the output circuit of the NC device 9. The temperature detected at -3 is converted into a digital signal and output to the input circuit of the NC device 9.

In addition, each heater 40 disposed adjacent to each storage hole 36 of the core stocker 28 is connected to a power supply 73 via switches SW4 to SW10.
It is connected to the.

Each of the switches SW1 to SW10 is further connected to an output circuit of the NC device 9, and is turned on / off by a signal output through the output circuit.

In this embodiment, the output of the thermocouple 74-1 at the nozzle of the heating cylinder 71 is input to the terminal 1 of the temperature converter 72,
The output of thermocouple 74-2 in the heating zone of band heater B2 is terminal 2
The output of the thermocouple 74-3 in the heating zone of the band heater B3 is input to the terminal 3, and the thermocouples provided at the terminals 4 to 10 of the temperature converter 72 for the respective storage holes 36 of the core stocker 28 are provided. 41 are connected correspondingly. That is, in FIG. 13, FC1
~ FC7 is a code set for each storage hole 36,
The thermocouples 41 of the storage holes corresponding to the cords FC1 to FC7 are connected to the terminals 4 to 10 of the temperature converter 72, respectively. The switches SW1 to SW10 are also thermocouples 74-1 to 74-3, and the storage holes F
It is provided corresponding to each of thermocouples corresponding to C1 to FC7.

FIG. 13 is a block diagram of the NC device 9 as a control device.

The NC device 9 has a microprocessor (hereinafter, referred to as CPU) 101 for NC and a CPU 102 for programmable machine controller (hereinafter, referred to as PMC).
Is connected to a ROM 109 storing a sequence program for controlling a sequence operation of the injection molding machine and a RAM 108 used for temporarily storing data.

The NC CPU 101 stores a ROM 107 storing a management program for controlling the entire injection molding machine, and drives the rotary arm 30 for injection, mold clamping, screw rotation, core replacement, and drive the core stocker 28. A servo circuit 105 that drives and controls a servomotor of each axis, such as a servomotor for an actuator or an ejector, is connected via a servo interface 104. 110 is a nonvolatile shared RAM composed of a valve memory and a CMOS memory.
It has a memory unit for storing an NC program and the like for controlling each operation of the injection molding machine, and a setting memory unit for storing various set values, parameters, and macro variables.

103 is a bus arbiter controller (hereinafter called BAC)
In the BAC103, the CPU 101 for NC and the CPU 102 for PMC, the shared ARM1
10, each bus of the input circuit 111 and the output circuit 112 is connected,
The bus used is controlled by C103. Reference numeral 114 denotes a manual data input device with a CRT display device (hereinafter referred to as CRT / MDI) connected to the BAC 103 via the operator panel controller 113, and is operated by operating various operation keys such as soft keys and numeric keys. Command and setting data can be input. Reference numeral 106 denotes a RAM connected to the CPU 21 for a bus, which is used for temporary storage of data and the like.

The output circuit 112 includes the solenoid valves 21a, 21b, 34, 35, 47, 57, 59, the electromagnetic solenoid 54, the mold temperature controller 10, the band heaters of the heating cylinders, and the core stockers 28 of the various actuators described above. A heater switch provided for the storage hole 36
SW1 to SW10, the temperature converter 72, and the servo circuit 105 of the servomotor of each axis are connected.

The input circuit 111 is connected to various sensors S1, S2, S3, S4, the mold temperature controller 10, and the temperature converter 72.

In addition, each servo circuit 105 is connected to a servomotor of each axis, and a position detector such as a pulse coder for detecting the rotational position of the servomotor provided on each servomotor is connected, and the speed of each servomotor is , To control the position.

In the configuration as described above, the NC device 9 includes the shared RAM 110
The PMC CPU 109 performs sequence control with the NC program for controlling each operation of the injection molding machine stored in the CPU and the parameters such as various molding conditions stored in the setting memory unit and the sequence program stored in the ROM 109. The NC CPU 101 distributes pulses to servo circuits of each axis of the injection molding machine via the servo interface 104, and controls the injection molding machine.

Injection molding operations: metering, mold clamping, injection, holding pressure,
The operation processing control such as cooling, opening, ejecting and the like perform the same operation as the conventional one, and the description of the operation will be omitted. The preliminary temperature control of the core and the automatic replacement operation of the core, which are features of the present invention, will be described below.

[Core Preliminary Temperature Control] FIG. 14 is an explanatory diagram of a table for storing a preset temperature set when the core 17 is stored in the core stocker 28. Such a table Tb is provided in the shared RAM 110. ing.

When storing each core 17 in the storage hole 36, operate the CRT / MDI 114 to switch the CRT screen to the core preliminary temperature setting screen,
As shown in FIG. 14, the names of the cores (core codes) 17-1 to 17-7 stored in the respective storage holes are set in association with the storage hole numbers (corresponding to the codes FC1 to FC7). Preheating temperatures T1 to T7 for the heaters are set.
The on / off control periods t1 to t7 are also set. On /
The off-control periods may all be the same, and in this case, they may be fixedly set in advance and need not be set when the core is stored. In addition, in FIG.
Q7 is the rotation position of each storage hole 36, that is, the rotation position of the servo motor M2 that drives the core stocker 28.By positioning the core stocker 28 at these rotation positions Q1 to Q7, the storage holes FC1 to FC7 are It can be positioned at the core removal position. Since this position is fixedly determined, there is no need to set it, and the setting was input when the injection molding machine was manufactured, and this position is not displayed on the CRT screen.

The codes 17-1 to 17-7 of the cores 17 stored in the respective storage holes 36 in this way, the preheating temperatures T1 to T7, and the on / off control periods t1 to t7 are set, and the shared RAM 110 is set. , The PMC CPU 102 performs preliminary temperature control of each core 17 based on the preliminary heating temperatures T1 to T7 stored in the table Tb. In addition, as in the conventional case, various molding conditions are set, the set temperature of each heating zone of the heating cylinder 71 and the set temperature of the mold are set and stored in the shared RAM 110. Outputs the set temperature to the mold temperature controller 10
The mold temperature controller 10 automatically controls the temperature of the heat exchange medium circulating in the mold and the core so as to reach the set temperature.

Further, the PMC CPU 102 repeatedly executes the temperature control shown in the flowcharts of FIGS. 15A and 15B at predetermined intervals. Note that this temperature control processing cycle is a cycle that is sufficiently shorter than the ON / OFF cycle for controlling ON / OFF of the band heaters B1 to B3 of the heating zone and the heater 40 of each storage hole 36.

The PMC CPU 102 first sets the index i to 1 (step S100), and sets a flag F2-
It is determined whether the flags F2i and F1i corresponding to the index i among 1 to F2-10 and F1-1 to F1-10 are set to 1 (steps S101 and S102). In addition, these flags F1-1 to F
1-10 and F2-1 to F2-10 are set to 0 by default. If the flags F2i and F1i are not 1, the PMC CPU 102
03, the temperature converter 72 is switched via the output circuit 112, and the index i
The temperature detected from the thermocouple input to the terminal i of the temperature converter 72 is input to the input circuit 111,
The detected temperature Tai from the thermocouple is read (step S10
3). Next, when the heater corresponding to the terminal i (the heater 39 corresponding to the accommodating hole codes FC1 to FC7 when i is 1 to 3 and the band heater B1 to B3 when i is 4 to 10) is turned on last time, The value of the register E1i that stores the temperature deviation detected at the terminal i is stored in the register E0i, and the set temperature Tsi of the heating zone or the storage hole corresponding to the set terminal is set.
(If i is 1 to 3, the set temperature set for the heating cylinder 71; if i is 4 to 10, the storage hole code FC
The detected temperature Tai read in step S103 is subtracted from the set temperatures T1 to T7 set for 1 to FC7 to obtain a temperature deviation and stored in the register E1i (steps S104 and S405).
Then, the value of the temperature deviation stored in the register E1i is added to the register ESi storing the integrated value of the temperature deviation (step S106). Next, the on-time ton is calculated by performing the calculation represented by the following first equation (step S107).

ton = K1 · E1i + K2 · ESi + K3 · (E1i−EOi) (1) In the first equation, K1, K2, and K3 are proportional, integral, and differential gains in temperature control, and E1i, ESi, and EOi are respective registers. , Ie, the temperature deviation detected at the present time, the integrated value of the temperature deviation, and the previously detected temperature deviation.

The on time ton obtained in this manner is set for the heating zone or the storage hole 36 corresponding to the terminal (i), and the temperature control cycle (on / off cycle) tpi (if i is 1 to 3, If the temperature control cycle stored in the work memory, i is 4 to 10, the temperature control cycles t1 to t7 set in the table Tb correspond to each other.) Only the on-time is changed to this temperature control cycle (on / off cycle) tpi (steps S108, S10
9). That is, the entire period of the temperature control cycle (ON / OFF cycle) is set to the ON time. Next, the on-time ton is subtracted from the temperature control cycle (on / off cycle) tpi to obtain the off-time toff (step S110), and the timers T1i and T2i respectively provide the on-time ton,
The off time toff is set (steps S111, S112). Then, the timer T1i is started, and the BAC103 and the output circuit are started.
The switch SWi is turned on via 112 and the band heater Bi of the heating zone corresponding to the index i or the heater 40 of the storage hole 36 is operated, and the flag F1i is set to 1 (steps S113 and S11).
4, S115). Next, it is determined whether or not the time of the timer T1i has expired (step S116). Since the time has not elapsed at the beginning, the process proceeds to step S122, and the index i is incremented by one. It is determined whether or not the control number is 10 or less (step S123).
Returning to step S101, the processing from step S101 is repeated.

Immediately after the start of operation, flags F2-1 to F2-10, F1-1 to F1
Since -10 is 0 in the initial setting, the processing of steps S101 to S116, S122, and S123 is repeatedly performed until the index i exceeds 10, and the heater 39 for each band heater B1 to B3 and each storage hole 36 is The calculated on-time heating cylinder and the core 17 in the storage hole 36 are heated.

In this way, the band heaters B1 to B3 and the heaters 40 are started to operate, and when the index i exceeds the number of band heaters and the number of storage holes, the processing of the processing cycle ends.

In the next processing cycle, since each of the flags F1-1 to F1-10 is set to 1, the processing of steps S100 and S101 is performed, and the process proceeds from step S102 to step S116 to execute the timer T1.
It is determined whether or not i has timed out. If the time has not expired, the process proceeds to step S122, and the index i is incremented by 1. If the index i is 10 or less, the process returns to step 101, and the index i exceeds 10 Steps S101, S102, S116, S
The processing of 112 and S123 is repeated, and the processing of the processing cycle ends.

After the next processing cycle, the above processing is repeated.However, when it is detected in step S116 that the timer T1i has expired, the switch SWi corresponding to the index i is turned off via the BAC 103 and the output circuit 112. (Step S117), Flag F1i
Is set to 0 and F2i is set to 1 (step S119), and
The timer T2i is started, the measurement of the off time toff set in step S112 is started (step S119), and it is determined whether or not the timer T2i is up (step S12).
0) If the time is not up, the process proceeds to step S122, and the index i is incremented by 1. If the index i does not exceed 10, the process returns to step S101 and repeats the above processing.

Thus, when the timer T1i has timed out and the ON time has elapsed, the switch is turned off and the measurement of the OFF time is started.

If the flag F2i is 1 and the measurement of the off-time is started in the next cycle, the process proceeds from step S101 to step S101.
The flow shifts to S120, where it is determined whether or not the time of the timer T2i has expired. If the timer T2i is on, the flow shifts from step S102 to step S116 to repeat the above-described processing.

When it is detected in step S120 that the timer T2i has expired, the flag F2i is set to "0". When the flags F2i and F1i are set to 0 in this way, in the next processing cycle, the processing from step S103 described above is performed.

The PMC CPU 102 repeats the above-described processing for each processing cycle, turns on / off the switches SW1 to SW10, heats the respective heating zones or cores 17 with the respective band heaters B1 to B3 and the respective heaters 40, and sets the respective settings. PID (proportional,
(Integral, derivative) control.

Also, when setting the temperature condition for injection molding or monitoring the temperature, if the CRT device is switched to the temperature condition setting and the monitor screen, the PMC CPU 102 is already shared.
The set mold temperature stored in the RAM 110, the set temperature of each heating zone, readout, displayed on the CRT screen, and the terminal of the temperature converter 72 via the output circuit 112 (the thermocouple of each heating zone or storage) The thermocouple 41) corresponding to the hole 36 is designated, and the temperature detected by each thermocouple is displayed on the CRT screen. Therefore, the current value of the mold temperature, the current temperature of each heating zone, and the current temperature of each core 17 of the core stocker 28 can be simultaneously monitored.

In the above embodiment, the temperature control of the heating cylinder 71 and the temperature control of the core of the core stocker 28 are simultaneously controlled.However, the preliminary temperature control of the core stocker 28 is performed with high accuracy like a heating cylinder. In some cases, it is not necessary to control the temperature, so that the preliminary temperature control of the core 17 of the core stocker 28 may be performed only at a different cycle from the temperature control of the heating cylinder. The control in this case is the same as the control processing of FIGS. 16 (a) and (b), and only the processing cycle becomes longer.

[Core exchange control] FIGS. 16 (a), (b), (c), and (d) show the case where the core exchange mechanism 6 (see FIGS. 5, 6 and 7) is used. 9 is a flowchart of a process performed by a PMC CPU 102 when a child replacement command is input.

Mold temperature, temperature of each heating zone of heating cylinder, mold clamping force,
When various molding conditions such as injection speed, holding pressure, and measured value are set, a core code to be used is input, and a core replacement command is input, the PMC CPU 102 executes the processes shown in FIGS. 16 (a), (b), ( c),
The processing shown in the flowchart in (d) is started.

First, from the rotational position of the servo motor M1, it is determined whether or not the rotational position of the rotary arm 30 is a mounting position P1 (a position at the time of performing a molding operation at the center position of the mother die 14) on the master 14a ( Step S200). The rotation position of each servo motor is set to N via the servo circuit 105 and servo interface 104 of each axis.
The CPU 101 for C stores the data in the read shared RAM 110 and the CP for PMC.
U102 reads the rotational position of the servo motor M1 from the shared RAM 110 and determines whether or not the position is the position P1 for attaching the core 17 to the master.If the position of the rotary arm 30 is this position P1, the master
Since it means that the core is attached to 14, in order to wash the cores 17a and 17b, the NC CPU 101 via the shared RAM 110 so that the movable platen 12 is positioned at the set position P3. Command. The NC CPU 101 performs pulse distribution to the mold clamping servo motor M0, rotates the movable platen 12, and moves the movable platen 12 with respect to the command position P3 by a signal from a position detector attached to the mold clamping servo motor M0. When the position reaches the in-position width, the NC PCU 101 transmits a positioning completion signal to the PMC CPU 102 via the shared RAM 110 (step S201). As described above, the movement command to the servo motor of each axis issued from the PMC CPU 102 is shared RA as described above.
It is performed through M110, and the drive control of the servo motor of each axis is
Controlled by the NC CPU 101. Hereinafter, in the driving of the servo motor, the exchange of signals between the PMC CPU 102 and the NC CPU 101 and the drive control of the servo motor of the NC CPU 101 are the same as those in the related art, and a description thereof will be omitted.

When the positioning completion signal is output from the NC CPU 101, the PMC
The CPU 102 turns on the electromagnetic valve 57 via the output circuit 112 (step S202), and operates the air actuator 60 of the mold cleaning device 8 to move the nozzle 58 to the center position of the core. Then, it is determined whether or not the sensor S4 is turned on (step S203). When the sensor S4 is turned on and the nozzle 58 reaches the center position of the cores 17a and 17b as shown in FIG. The nozzle is turned on (step S204), the cleaning liquid is supplied to the nozzle 58, and the cleaning liquid is ejected from the nozzle 58 in both front and rear directions to clean the cores 17a and 17b fixed to the matrix 14. Then, the timer A1 is started, and when the set time has elapsed and the timer A1 times out (steps S205 and S20).
6), the electromagnetic valve 59 is turned off to stop the ejection of the cleaning liquid, and the electromagnetic valve 57 is turned off to raise the nozzle 58 and return to the home position (steps S207 and S208).

Next, a small amount δ from the position touched by the cores 17a and 17b.
Command to move the movable platen up to position P4
When the NC CPU 101 moves the movable platen 12 and a movement completion signal is sent (step 209), the eject rod 50
Command to the servo motor M3 that drives the motor to a position slightly before the cores 17a and 17b touch (step S2
10), the electromagnetic solenoid 54 is actuated for a short time to apply an impact force to the core 17b fitted to the master 14b on the movable platen 12 side, thereby releasing the fit between the core 17b and the master 14b (step) S21
1) Then, start the timer A2 (step S21)
2), whether the timer A2 has counted the set time and the time is up, and whether the servo motor M3 for eject operates and the eject rod 50 reaches the command position, the movement is completed and the in-position width Reached, and the movement completion signal is for NC
It is determined whether the data has been sent from the CPU 101 (steps S213 and S21).
4) If the timer A2 times out before the movement completion signal is sent, it is assumed that the core 17b has not been disengaged from the master block 14b, and the process returns to step S211 again, where the solenoid is again connected to the core 17b. Give impact force by 54. Thereafter, until the movement completion signal is detected (the processing of steps S211 to S214 is repeated. When the movement completion signal is sent, the core 17b and the master block 14b are received.
Means that the connection with the servo motor M3 that drives the eject rod 50 is output to the servo circuit of the servo motor M3 via the output circuit 112.
Outputs a movement command to a position P6 that completely exits from the core mounting hole 48 of the master block 14b, and drives the servo motor M3 while limiting the output torque (step S215). At the same time, a move command to the core replacement position P7 is issued to the mold clamping servomotor M0 at a speed such that the movable platen 12 moves at a speed slightly lower than the movement speed of the core 17b, and the movable platen 12 is retracted to open the mold (step S21)
6). Since the moving speed of the core 17b is faster than the moving speed of the movable platen 12, and the output torque of the servo motor M3 for driving the core 17b is limited, the core 17b is pressed and held in a state in which it is in close contact with 17a. You. Then, when the eject rod 50 is moved to the set position P6 by driving the servo motor M3 and a movement completion signal is sent (step S21).
7) Move the eject rod 50 to the home position P8
To the air cylinder and turn off the solenoid valve 47.
Unlock the core 17a from the 46 to the master 14a (step
S218, S219). Even if the eject rod 50 does not press the core 17b, the cores 17a and 17b maintain a close contact state by the guide pins between the cores 17a and 17b, and the cores 17a and 17b
Is held by the matrix 14a on the fixed platen 11 side.

Next, it is determined whether the movable platen 12 has moved to the position P7 and a movement completion signal has been issued (step S220). When the completion signal has been issued, the servomotor M1 is driven to rotate the rotary arm 30 to the core stocker 28. Is moved to the position P2 (the position shown in FIG. 7) corresponding to the storage hole 36 of FIG. Since the core stocker 28 does not rotate after taking out the core 17, when the rotary arm 30 is positioned at the position P2, the center position of the core holding ring 33 of the rotary arm 30 It matches the center position of the storage hole 36 taken out. Then, when the movement completion signal is output, the electromagnetic valve 35 is turned on and the actuator 32 is operated (steps S221 and S222). Then, it is determined whether the photoelectric sensor S2 is on and the magnetic sensor S3 is on. Turning on the photoelectric sensor S2 indicates that the core 17 is not detected, and turning on the magnetic sensor S3 means that the core 17 is stored in the storage hole 36 of the core stocker 28. (Steps S223 and S224). Therefore, when the photoelectric sensor S2 is turned on and the magnetic sensor S3 is turned on, the core 17 is
It means that it is completely housed in the solenoid valve 35
Is turned off, the actuator 32 is returned, and (Step
S225), the core storage hole position of the core code set as the core to be used is read from the table Tb, and the servo motor M2 is driven so as to position the core stocker 28 at the position (step S226). When the movement completion signal is output from the NC CPU 101, the solenoid valve 34 is driven, and the pushing actuator is driven.
31 is driven to insert the selected core into the core holding ring 33 (step S227). While the core is moving from the storage hole 36 to the core holding ring 33, the photoelectric sensor S2 detects the core and is off, and the magnetic sensor S3 has the core 17 partially remaining in the core storage hole 36. As long as it is on. The core 17 is moved to the core holding link 33, the photoelectric sensor S2 is turned on and no core is detected, and the magnetic sensor S3 is turned off and it is detected that the core is not in the core storage hole 36. (Steps S228, S229), the solenoid valve 34
Is turned off, and the pushing actuator 31 is returned (step S230).

Next, the servomotor M1 is driven, and the rotating arm 30 is
Is positioned at the core mounting position P1 (step S231),
When the movement completion signal is issued, the solenoid valve 47 is turned on and the core
17 is locked to the matrix 14a by the air cylinder 46 as shown in FIG. 9 (step S232). Then, the servo motor M0 is driven to move the movable platen 12 to the set mold clamping force position (step 233), and when a movement completion signal is issued,
When the movable platen 12 is moved to the mold clamping position, the core 17b is fitted into the core mounting hole. Thus, the core 17a is fixed to the matrix 14a on the fixed platen 11 side, and the core 17b is fixed to the matrix 14b on the movable platen side. Next, the movable platen 12 is moved to the position P9 to open the mold (step S234), and the core replacement process ends.

When a core replacement command (core mounting command) is input in a state where the core 17 is not mounted on the matrix 14, the CPU 10
2 is step S200, in which the position of the rotating arm 30 is the mounting position P1.
Is detected, the process proceeds from step S200 to step S226, and the processing of the above-described steps after step S226 is performed.

Furthermore, if it is a command to simply remove the core from the matrix instead of replacing the core, the process from step S200 to step S225 is performed. As described above, since the processing is the same as the processing from step S200 to step S225, the description is omitted.

[Second Embodiment] The second embodiment focuses on the mounting portion of the core, in which the fixed platen 11 and the movable platen 12 are configured in the mold 14 itself, and the core 17 is directly connected to the platens 11 and 12. It differs in that it can be attached to

Other configurations are the same as those of the first embodiment. The master 14a in the description of the first embodiment is replaced with the fixed platen 11,
4b can be configured by replacing the movable platen 12.

[Third Embodiment] Fig. 18 shows a third embodiment focusing on the mold temperature control mechanism 5, wherein the structure of the mold clamping unit 3 is a fixed platen 11 and a movable platen 12 is a mold 14 of a mold. It belongs to the type of the second embodiment described above.

Therefore, the temperature adjusting liquid passage 13 of the fixed platen 11 and the movable platen 12 has the same configuration as the temperature adjusting liquid passage 15 of the matrix 14 of the above embodiment, and the mold temperature adjusting mechanism 5 is substantially a platen. It has a temperature control mechanism.

However, in this embodiment, the core 17 (a, b) is also provided with the temperature control liquid passage 63 (a, b), and the temperature control liquid passage 13 on the platen side.
(A, b) are connected in series. Also, core 1
The temperature control liquid passages 13 and 63 in the platen 11 and the platens 11 and 12 are connected by the same automatic connection structure 16 as described above. However, in this case, as will be described later, since the core 17 is mounted on the platens 11 and 12 by sliding from above, the protruding amount of the O-ring 24 provided on the port 23 side is smaller, and the surface is slippery. It is good.

The operation as the mold temperature control mechanism 5 does not make any particular difference as long as the supply of the temperature control liquid is stopped by operating the solenoid valves 21 (a, b) in advance when replacing the core.

 Other configurations can be the same as those of the first embodiment.

In this embodiment, the injection work is performed by attaching a mold composed of the core 17 and the mother die 14 to the platens 11 and 12, but since the molded product is small, the exchange of the mold itself has a core having a molding cavity. It is based on the technical idea that the exchange of 17 alone is sufficient and the exchange of the matrix 14 is almost nonexistent, and it is more reasonable to configure the platens 11 and 12 themselves into a matrix.

Further, by providing the temperature control liquid passage 63 in the core 17 and directly adjusting the core temperature, it is possible to improve the responsiveness regarding the temperature control.

In this embodiment, when it is necessary to accurately position the temperature control liquid passage 63 of the core 17 with the port 23 of the temperature control liquid passage 13 on the platen side, the cross section of the core 17 is made polygonal. Storage hole 36 of core stocker 28 and core holding ring 33
The holes are also made the same polygon, and the arrangement angle is adjusted for each hole.

Fourth Embodiment FIGS. 19, 20, and 21 schematically show a fourth embodiment focusing on the core exchange mechanism 6. FIG.

It should be noted that the mold clamping portion 3 is either of the type of the first embodiment in which the matrixes 14a and 14b are mounted on the fixed platen 11 and the movable platen 12, or the type of the second embodiment in which the platens 11 and 12 also serve as the matrix 14. But it is good.

 The figure relates to the type using the mother dies 14a and 14b.

The core 17 (movable side portion 17) of the master 14b is attached to the master 14a.
A tapered core mounting hole 301 similar to the mounting hole 48 in b) is formed, and a solenoid 302 used as an electromagnetic hammer is arranged on both sides thereof. The configuration on the side of the matrix 14b is the same as that of the first embodiment, but both molds 14a,
The difference is that the joining surface of 14b is also close, and the structure is such that the whole of the core 17 is clamped in a wrapped form.

As shown in FIG. 21, the fixed side portion 17a of the core 17 has a tapered front surface and includes a flange 303 and an engagement groove 304. The engagement groove 304 has a wall 305 at the rear, and is spontaneously interrupted and opened at the front by crossing the tapered surface.

When the fixed side portion 17a of the core 17 is attached to the matrix 14a,
As shown in the figure, the flange 303 abuts on the rear surface of the matrix 14a,
In addition, a solenoid 302 is located in front of it.

Rotating arm 30 is rotated by the servo motor M ₁ is a retractable configured in the air activator Yu eta, core holding portion 307 is formed at the tip of the piston 306 as in the FIG. 20 . The cross section of the piston 306 is rectangular and cannot rotate due to expansion and contraction only with respect to the cylinder side. The core holding portion 307 has an upper finger 308 and a lower finger 309 fixedly formed. A solenoid 310 is fixed downward to 308, and its plunger 311
Can protrude toward the lower finger 309. The holding portion 307 is fixed in a posture in which a line connecting the upper finger 308 and the lower finger 309 is orthogonal to the axis of the core 17 mounted on the matrix 14.

With the servomotor M ₄ is fixed to the mother mold 14a side,
A ball screw 312 is suspended in parallel with the tie bar 18. Ball screw 312 is driven by a motor M ₄ above, to move the ball nut 313 screwed thereto back and forth.

Servomotor M ₁ for rotating the rotation arm 30 is attached to the gantry to move together is fixed to the ball nut 313, thus, the core holding portion 307 of the rotating arm tip with respect to the stationary platen 11 Can move back and forth.

In this embodiment, the accommodation hole 36 of the core stocker 28 is a cylindrical hole having a bottom and an open rear, and has the same depth as the core mounting hole 301 in the mother die 14a. Sensor S ₅ for detecting the arrival of the core 17 to the bottom core 17 abuts to be accommodated,
Further, a positioning ridge 314 that fits into the engagement groove 304 of the core 17 is provided on the inner wall surface.

The return actuator 32 is fixedly arranged so as to coincide with the axis of the storage hole 36.In this case, the return actuator 32 is arranged behind the rear end of the stroke of the rotary arm 30, and the amount of expansion and contraction of the piston is arranged on the axis. This is the distance from when the rear end of the core 17 is pushed until the front end abuts against the bottom of the storage hole 36.

The replacement of the core 17 is roughly as follows: the rotating arm 30 expands and contracts the arm, approaches the core 17 from the side, grasps it, moves backward, pulls it out from the master 14a or the core stocker 28, and then An operation is performed in which the core is rotated to a position where the core is stored or mounted, and further moved forward at that position to store and mount the core (described later). Therefore, unlike the first embodiment, a long mounting groove 46 extending from the top surface of the matrix 14a to the core mounting portion is not required.

[Core Exchange Control in Fourth Embodiment] The control of the core exchange mechanism in the fourth embodiment is substantially the same as the flowchart shown in FIG.

However, the core exchanging mechanism of the fourth embodiment includes a rotating arm 30.
Is retracted from between the mother dies 14a and 14b during the molding operation. Therefore, it is impossible to determine whether the core 17 is mounted on the mother dies based on the position of the rotary arm 30 as in step S200.

Therefore, a flag that is set to “1” when the core 17 is mounted on the master 14 is provided, and in step S200, the core 17 is determined by determining whether the flag is “1”.
It is determined whether or not it is attached to. If the flag is set to "1", steps S201 to S2 in FIG.
Perform step 18. Next, in the fourth embodiment, since the air actuator 46 is not provided, the process of turning off the solenoid valve 47 in step S219 is not performed, and the process proceeds to step S220, where the movable platen 12 takes out the core 17. It is determined whether or not it has moved to a predetermined position where possible, and when the movement to that position is completed, the servomotor M1 is driven, and the rotating arm 30 is rotated to a position where the core holding unit 307 can hold the core 17, and To squeeze. Next, the air actuator is operated to extend the piston 306. When the piston 306 is extended, the plunger 31 of the solenoid 310 provided in the core holding portion 307
Since 1 is set to a position where it engages with the engagement groove 304, after extending the piston 306, the solenoid 310 is operated to engage the plunger 311 with the engagement groove 304, and remove the core. Hold. Next, the servo motor M4 is driven by applying a torque limit, and a movement command is issued to a position where the core 17 is completely removed from the fixed-side master block 14a, and the solenoid 302 is operated in the same manner as in steps S211 to S214. Actuate to release the fitting between the core fixed side part 17a and the matrix 14a, and fix the fixed side part 17a.
a is taken out from the mounting hole 301. When the servo motor M4 reaches the set position, the piston 306 is contracted, and then the rotary arm 30 is rotated by the servo motor M1, and the piston 306 is extended to correspond to the storage hole 36 of the core stocker 28. Then, the servomotor M4 is driven to move the gripping core 17 into the storage hole 36. In this case, the positioning ridges 314 are engaged with the engagement grooves 304 to prevent the core 17 from rotating in the storage hole. When the core 17 is stored in a predetermined amount in the storage hole 36,
After the operation of the solenoid 310 is released and the piston 306 is contracted, the rotating arm 30 is rotated to position it at the home position. Further, the solenoid valve 35 is turned on, the return actuator 32 is operated, and the core 17 is inserted into the storage hole 36 until the sensor S5 is turned on. When the sensor S5 is turned on, the solenoid valve 35 is turned off, the flag is set to "0", and the core 17 is used as a master mold.
I remember that it was removed from 14.

When the core 17 is mounted on the matrix 14, the servomotor M2 is driven to position the core stocker 28 at the selected core position, and then the rotating arm 30 is rotated and then the piston 306 is extended. To hold the selected core, and actuate the solenoid 310 to engage the plunger 311 in the engagement groove 304,
M4 is driven to remove the selected core from the storage hole 36, and then the rotary arm 30 is rotated by the servomotor M1 to form the master 14
Position it in a position where it can be mounted on Then servo motor
When M4 is driven and the core 17 is inserted into the mounting hole 301 of the fixed-side mold 14a and inserted by a predetermined amount, the movable platen 12 is advanced,
The core 17 is fitted into the mounting hole 48 of the movable master block by a predetermined amount, and both ends of the core are supported by the fixed master block 14a and the movable master block 14b. Next, after the operation of the solenoid 310 is released and the piston 306 is contracted, the rotating arm 30 is rotated and positioned at the home position.

When the movable platen is moved to the position of the set mold clamping force, the core 17 is fitted and fixed in the mounting holes 301 and 48.

Then, the flag is set to “1” and the core mounting process ends.

Fifth Embodiment FIG. 22 focuses on the core holding portion 307 of the rotary arm 30. The core holding portion 307 is opened and closed via a lever 316 and a gear 317 by driving of an actuator 315, and Hold and release.

Such a core holder 307 can be used by replacing the operation of the solenoid 57 with the operation of the actuator 315 in the case of the fourth embodiment.

[Other embodiments]

The core stocker 28 in the core exchange mechanism 6 may be configured to move in the horizontal direction or up and down to select the required core 17 instead of rotating.

The take-out direction can be variously adopted, such as take-out in a lateral direction and take-out in a vertical direction.

The wrist of the part holding the core may be rotatable.

The core mounting groove 39 is not an arc-shaped one as in the above embodiment, but a linear one. For example, the core 17 linearly guides the core 17 from the upper direction of the matrix or platen, or from the side to the mounting position. The arm provided with the core holding portion, which is a mounting groove, may be moved linearly between the core stocker 28 and the mounting position on the mother die or the platen.

When the core 17 is mounted by the core mounting holes (48, 301), the arm holding the core is moved linearly between the core stocker 28 and the mounting position on the mother die or platen. May be added at both ends.

Advantageous Effects of the Invention The core is automatically replaced, so that various and small amount injection molding operations can be performed efficiently and continuously.

By providing the core stocker and the mold cleaning device, it is not necessary to store the core.

[Brief description of the drawings]

FIG. 1 is an overall block diagram of one embodiment of the present invention, FIG. 2 is a plan view shown in section, FIG. 3 is a perspective view, FIG. FIG. 6 is a schematic plan view showing a part in cross section, FIG. 6 is an overall perspective view, FIG. 7 is a side view when cut along II in FIG. 6, and FIG. FIG. 9 is a front view of a main part showing a partial cross section, FIG. 10 is a front view of a main part showing a partial cross section, FIG. Is a front view of the mold cleaning device, FIG. 12 is a block diagram of a control unit configuration for controlling the temperature of the heating cylinder and the core of the core stocker, FIG. 13 is a block diagram of an NC device as a control device, FIG. 14 is an explanatory diagram of a table for storing a preset temperature set when the core 17 is stored in the core stocker 28, FIGS. 15 (a) and (b) are flowcharts of temperature control, and FIGS. ), (B), (c) and (d) are flowcharts of the core exchange process, FIG. 17 is a plan view showing the second embodiment in partial cross section, and FIG. 18 is a third embodiment. FIG. 19 is a partial plan view, FIG. 19 is a schematic plan view showing the fourth embodiment in partial cross section, FIG.
FIG. 21 is a perspective view of the core, and FIG. 22 is a partial plan view of the fifth embodiment. 1 ... injection molding machine, 2 ... injection section, 3 ... mold clamping section, 4 ...
... Injection molding machine body (body), 5 ... Mold temperature control mechanism, 6 ...
Core exchange mechanism 7, Core ejection device 8, Mold cleaning device 9, NC device 10, Mold temperature control device 11, Fixed platen 12, Movable platen 13, , 15 …… Temperature control fluid passage, 14 …… Matrix, 16 …… Automatic connection structure, 17 …… Core, 27
Core exchange unit, 28 Core stocker, 29 Core preliminary temperature controller, 30 Rotating arm, 31 Extrusion actuator, 32 Return actuator, 33 Core holding ring, 39 ... core mounting groove, 40 ... heater, 41 ... thermocouple, 45 ... stopper, 48 ... core mounting hole, 50 ... eject rod, 52 ... eject pin, 58 ... nozzle
60 …… Air actuator.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Susumu Ito 3580 Kobaba, Oshino-mura, Oshino-mura, Minamitsuru-gun, Yamanashi Pref. 3580 No. FANUC Co., Ltd.Product Development Research Center (72) Inventor Kikuo Watanabe Fukushima Co., Ltd.Product Development Research Center, Oshino-mura, Minamitsuru-gun, Yamanashi Prefecture 3580 Kobaba FANUC CORPORATION Product Development Laboratory (72) Inventor Toshio Matsukura 2-43 Hatagaya, Shibuya-ku, Tokyo Olympus Optical Industrial Co., Ltd. (72) Inventor Kaoru 2-43 Hatagaya, Shibuya-ku, Tokyo No. 2 Olympus Optical Co., Ltd. (72) Invention Hiroshi Yonekubo 2-43-2, Hatagaya, Shibuya-ku, Tokyo Inside Olympus Optical Industrial Co., Ltd. Issei Olympus Optical Co., Ltd. 2-43-2 Hatagaya, Shibuya-ku, Tokyo

Claims (4)

(57) [Claims] A core stocker for storing a plurality of cores as a pair by assembling a fixed side and a movable side, core selecting means for selecting a core, and a pair of cores from the core stocker. Core exchange means for transporting the unloaded core to the mounting position of the mother die, and for transporting the core from the mounting position to the core stocker and storing the core in the respective mother die corresponding to each of the pair of cores Each locking means for fixing, and control means, the control means,
When attaching the core to the matrix, the core input to the control means is selected by driving the core selection means, and the core exchange means is driven to select the core. It is conveyed from the child stocker to the mounting position of the matrix, the movable platen is moved to set the core in each matrix, and a pair of cores are locked to each matrix by the above-described locking means, and the core is placed in the matrix. When the child is automatically attached and the core is removed from the mother die, the pair of cores are joined and held in the core holder of the core exchange means,
An automatic core exchange system in which the lock means is released, the movable platen is moved to open the space between the mother dies, and the core exchange means conveys a pair of cores and automatically stores them in the core stocker. 2. The mold fixed to the fixed platen has a mounting groove for guiding the core to the core mounting position, and the core changing means moves the core along the mounting groove. 2. The core automatic exchange method according to item 1. 3. When an automatic cleaning device is provided, when the core is removed from the matrix, the control device moves the movable platen to open the joint surface of the core and separates the nozzle of the automatic cleaning device. 3. The core automatic exchange system according to claim 1, wherein the core is taken out after cleaning the core joint surface by ejecting a cleaning liquid between the core joint surfaces. 4. Each core storage section of the core stocker has a heater for heating the core and a temperature sensor for detecting the temperature of the core storage section. 2. The feedback control of the sections to respective set temperatures.
Item 4, Item 2 or Item 3;